I use greylisting with spf, and blacklisting. I've been happy with it so far. There are the problems of delays, and the occasional server that doesn't have an spf record, and decides not to re-try -- or when it does, it comes from a different subnet, or changes it's "from" address... but it's not that bad.
My filter, however, is not optimal. -John Davide Libenzi wrote: >How many of you ever employed this? > >http://projects.puremagic.com/greylisting/whitepaper.html > >This would be a pretty easy pre-data filter to write ... > > >- Davide > > > - To unsubscribe from this list: send the line "unsubscribe xmail" in the body of a message to [EMAIL PROTECTED] For general help: send the line "help" in the body of a message to [EMAIL PROTECTED]
